METHOD FOR MANUFACTURING RING MEMBER FOR BEARING, AND MOLD FOR INVERSION WORKING

    公开(公告)号:EP4420807A1

    公开(公告)日:2024-08-28

    申请号:EP22898485.2

    申请日:2022-11-16

    申请人: NSK Ltd.

    摘要: A method for manufacturing a bearing ring member includes an inversion step of deforming a workpiece having an annular shape by sandwiching the workpiece between a punch disposed on a first side in a predetermined direction and a die disposed on a second side. The punch has a first R surface formed in a circular arc shape. The die has a second R surface formed in a circular arc shape, and a tapered surface inclined with respect to the predetermined direction. The inversion step includes a first step of deforming the workpiece using the punch and the die in a state where the first R surface and the second R surface are in contact with the workpiece, and a second step of deforming the workpiece using the punch and the die in a state where the first R surface and the tapered surface are in contact with the workpiece.